darkpssngr

static string GetSsoUrl(string baseUrl, string secret, string name, string email) {
    var timems = (DateTime.UtcNow.Subtract(new DateTime(1970, 1, 1))).TotalSeconds.ToString();
    return String.Format("{0}/login/sso?name={1}&email={2}&timestamp={3}&hash={4}",
        baseUrl, Server.UrlEncode(name), Server.UrlEncode(email), timems, GetHash(secret, name, email, timems));
}

private static string GetHash(string secret, string name, string email, string timems) {
    var input = name + secret + email + timems;
    var keybytes = Encoding.UTF8.GetBytes(secret);
    var inputBytes = Encoding.UTF8.GetBytes(input);